<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  
  </head>
  <body>
    <div id="app">
        <button @click="createMsg">动态添加一个数据</button>
        <div v-if="isShow">
          <button @click="changeMsg">修改这个数据</button>
          {{msg}}
        </div>
    </div>

    <script src="./vue.global.js"></script>
    <script>
      const { createApp } = Vue;
      const app = createApp({
        data() {
          return {
            isShow: false
          };
        },
        methods: {
          changeMsg(){
            this.msg = '值改变了';
          },
          createMsg(){
            this.msg = '这是值是动态添加的';
            this.isShow = true;
          }
        },
      });
      app.mount("#app");
    </script>
  </body>
</html>
